Protective benefit of folded linear HDPE board sand fences along the Golmud-Korla Railway,China:Field observation and wind tunnel study  

作　　者：ZHANG Kai TIAN Jianjin WANG Zhenghui ZHANG Hailong ZHANG Xingxin 

机构地区：[1]College of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730000,China [2]Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [3]College of Civil Engineering,Chongqing University,Chongqing 400045,China

出　　处：《Journal of Mountain Science》2024年第7期2206-2219,共14页山地科学学报（英文）

基　　金：financially supported by the Chang Jiang Scholar and Innovation Team Development Plan of China(IRT_15R29);the Basic Research Innovation Group Project of Gansu Province,China(21JR7RA347);the Natural Science Foundation of Gansu Province,China(20JR10RA231)。

摘　　要：The Milan Gobi area of the Golmud-Korla Railway in northwest China is located in the lower dispersal area of the mountain pass and has strong winds with evident double wind direction characteristics.This study introduced a novel sand fence deployment technique,termed‘folded linear deployment',designed to position the sand fence orthogonally to the two predominant wind directions for optimal protection.This study used wind tunnel and field tests to evaluate the wind and sand flow characteristics,as well as the windproof and sandresistant performance of folded linear HDPE(Highdensity polyethylene)board sand fences.The results suggest that the airflow around the fence creates clear zoning characteristics.The deceleration area on the BSF(backwind side of the sand fence)is much larger than that on the DSF(downwind side of the sand fence).Thus,sand particles are primarily deposited on the BSF.At different wind speeds,the airflow at 2 and 5 h on the DSF is not disturbed.The WSP(wind speed profile)presents a logarithmic distribution.The airflow is disturbed at 1-20 h on the BSF,and the WSP gradually deviates from the logarithmic law.However,as the airflow moves away from the fence,the WSP gradually approaches a logarithmic distribution.Meanwhile,the WPE(windproof efficiency)and SRE(sand-resistant efficiency)of the sand fence exceed 80%.In addition,the results of wind tunnel tests are compared with those of field tests.The overall dispersion is good,and the best dispersion is found at z/H=2.00,indicating good agreement between the two test results.This study provides a scientific basis for the design of sand hazard control measures,similar to the railway project in the Gobi Gale area.

关 键 词：Folded linear HDPE board sand fence Double wind direction Gobi area Protection benefit 

分 类 号：U216.413[交通运输工程—道路与铁道工程]